freebsd-src/libexec/save-entropy
Xin LI 46413cedf7 Reduce disk write load in /usr/libexec/save-entropy.
Before this commit, the save-entropy script rotates entropy files
like logs. This involves creating a new file that holds the entropy
and renaming of all existing entropy files. However, the entropy
data do not really need to be kept in a particular order, and
replacing the oldest file is sufficient.

This commit replaces the rotation with a scan in the
[1..entropy_save_num] space that finds the first empty slot, or
the slot of the oldest file, and writes entropy into that slot.

This also fixes an issue that prevents save-entropy from saving
any entropy when there is one non-regular file in any slot as a
side effect.

Based on an earlier patch from peterj@.

PR:		134225
Reported by:	peterj
Reviewed by:	csprng (cem, markm)
MFC after:	2 weeks
Differential Revision:	https://reviews.freebsd.org/D22612
2019-11-30 20:06:53 +00:00
..
Makefile Remove NO_OBJ 2015-06-11 04:22:17 +00:00
Makefile.depend Add META_MODE support. 2015-06-13 19:20:56 +00:00
save-entropy.sh Reduce disk write load in /usr/libexec/save-entropy. 2019-11-30 20:06:53 +00:00